Segment: 04 of 08, Organic Snapdragon Production: High Tunnel and Plant Date Trials
Webinar Date: July 23, 2026
Speaker: Kate Cassity-Duffey, University of Georgia Department of Horticulture
Duration: 20:18.5
Series: Cut Flower Symposium
CEU Categories: [PENDING]
Source: Corrected SRT (Stage 1), GTBOP_Transcript_2026-07-23_CassityDuffeySnapdragons.srt (301 blocks)
Twelve prompts, covering 0:00 to 20:18 with no gaps. Each one marks a segment a course developer can cut as a Moodle subsection, and each task is answerable from the video alone.
Review Task 1
Watch: 0:00 – 1:32
Task: Note what the speaker says she will cover today and why it differs from the topic her recorded introduction announces.
Key Points to Identify:
- The recorded introduction promises field-grown sunflowers and lisianthus
- She gives part one instead, on snapdragons, because of technical issues
- She is a soil scientist by trade who reached cut flowers through organic vegetable growers
Review Task 2
Watch: 1:32 – 3:20
Task: List the reasons organic vegetable growers are adding cut flowers, and the field problems the South adds to that decision.
Key Points to Identify:
- Cut flowers as a value-added product in CSAs and at farmers markets, with a premium from local florists
- High light and long days shorten stems, and field flowers come in damaged or tattered
- Commercial grade runs around 60 centimeters for most cut flowers
Review Task 3
Watch: 3:20 – 5:28
Task: Trace a unit of organic nitrogen from the fertilizer bag to the plant, and name every point at which it can be lost.
Key Points to Identify:
- Mineralization by soil microorganisms produces plant available ammonium; nitrification produces nitrate
- Three loss pathways: immobilization, nitrate leaching, ammonia volatilization
- Her stated reason this is hard, that all of these rates have to be predicted at once
Review Task 4
Watch: 5:28 – 6:48
Task: Write down the design of the high tunnel versus field trial and the three things the rating scale measures.
Key Points to Identify:
- December 1 plant date, two cultivars, about a hundred plants per plot, replicated four times
- Madame Butterfly Bronze with White and Chantilly Bronze
- A 1 to 10 scale covering stem length, inflorescence length, and density
Review Task 5
Watch: 6:48 – 8:40
Task: Record the first harvest, last harvest, and harvest duration results for both cultivars, and note which one surprised her.
Key Points to Identify:
- No difference in first harvest date between structures, which she calls surprising, reasoning that flowering answers to light as well as temperature
- Chantilly, about 15 harvest days in the field against about eight in the tunnel
- Madame Butterfly, about two weeks in the field against more than ten days in the tunnel
Review Task 6
Watch: 8:40 – 9:41
Task: Note what the high tunnel gained in stem length and what it cost in density, and the reason she gives for the density result.
Key Points to Identify:
- Field stems about 10 centimeters, or four inches, shorter than tunnel stems
- Flowers spreading down the stem, worst in the Chantillys, leaving a less dense spike
- A winter that ran from the 80s in February back to 20 degrees, with tunnel heat making it worse
Review Task 7
Watch: 9:41 – 10:30
Task: Summarise her four takeaways from the high tunnel versus field trial as a decision a grower could act on.
Key Points to Identify:
- Tunnel gives a more intense and shorter harvest; field stretches it out
- No difference in first flower timing
- Tunnel added about 10 centimeters of stem in both cultivars, against a density cost
Review Task 8
Watch: 10:30 – 11:47
Task: Record the design of the plant date trial and the full fertility program, including why she says the rates look high.
Key Points to Identify:
- January 7 and March 11 plant dates, about two months apart, eight cultivars, run with Johnny’s
- 100 pounds of nitrogen at planting plus 50 side-dressed about halfway through the season
- Potassium as potash, because southern soils leach it quickly; organic fertilizer releases over time
Review Task 9
Watch: 11:47 – 14:34
Task: Build a table of the eight cultivars as she walks them, recording group where she gives one, stem length where she gives one, and her comment on quality.
Key Points to Identify:
- Stem lengths she states: Avignon Lavender 2 around 50 centimeters, Cannes Light Bronze about 60 to 65, Costa Summer 65 to 70
- Groups she states: Antibes Apricot I group one, Avignon Lavender 2 group 2, Potomac Orange and Potomac Lavender group three or four
- The cultivars she calls short-stemmed, Antibes Apricot I and Avignon Apricot, and the flopping that follows
Review Task 10
Watch: 14:34 – 15:57
Task: Compare the two plant dates on harvest timing, stems per plant, and bloom quality, and note what did not scale with the 60 day planting gap.
Key Points to Identify:
- Harvest began around late April for the first plant date and closer to May for the second, far short of 60 days apart
- About two stems per plant on the January date, closer to three to four on the March date
- Bloom quality and overall rating similar between the dates, with the longer stems on the second
Review Task 11
Watch: 15:57 – 17:24
Task: Note her closing takeaways for succession planting and what she plans to change, or keep, in year two.
Key Points to Identify:
- Planting two months apart does not produce harvests two months apart, so succession planting works through plant date or cultivar choice
- Stem thickness ran heavy on the second plant date, enough to bother some florists
- Year two repeats both trials to separate weather effects from cultivar effects
Review Task 12
Watch: 17:24 – 20:18
Task: Work through the four chat questions and record her answer to each, including the one a participant corrects.
Key Points to Identify:
- About 10 weeks from seed to transplant, with fall bloom light-dependent; she will start one in August to find out
- Four inch spacing, four rows per plot, on three foot centers; year two keeps the same cultivars
- Groups index performance window and flowering time, group ones cooler and faster, twos and threes longer, with some cultivars groupless
Coverage Map
| Task | Range | Blocks | Prose transcript section |
|---|---|---|---|
| 1 | 0:00 – 1:32 | 1–24 | Introduction and Recorded Bio; Part One, and Why Snapdragons |
| 2 | 1:32 – 3:20 | 25–48 | Organic Cut Flower Production in the South |
| 3 | 3:20 – 5:28 | 49–73 | Organic Fertility and the Nitrogen Cycle |
| 4 | 5:28 – 6:48 | 74–93 | Trial One, Design and Rating Scale |
| 5 | 6:48 – 8:40 | 94–116 | Trial One, Results: Harvest Timing and Duration |
| 6 | 8:40 – 9:41 | 117–130 | Trial One, Stem Length and Density |
| 7 | 9:41 – 10:30 | 131–142 | Trial One, High Tunnel Versus Field Takeaways |
| 8 | 10:30 – 11:47 | 143–157 | Trial Two, Design and Fertility Rates |
| 9 | 11:47 – 14:34 | 158–203 | Trial Two, The Eight Cultivars |
| 10 | 14:34 – 15:57 | 204–223 | Trial Two, Plant Date Results and Stems Per Plant |
| 11 | 15:57 – 17:24 | 224–246 | Takeaways, Year Two, and Contact |
| 12 | 17:24 – 20:18 | 247–301 | Questions and Answers |
Every boundary lands on a block start in the corrected SRT. The twelve ranges are contiguous and cover the full 20:18.5 with no overlap.
Scope Notes
Task 12 does not ask a student to decide Potomac’s group. She gives group one at 18:05, a participant corrects it at 19:43 as typically a three to four, and she accepts the correction. Blocks 178 and 191 agree with the correction. The task asks the student to record the exchange, which is what the recording shows.
No prompt points at the second part of her talk. At 16:52 she asks the audience to come back for lisianthus and sunflowers “after around the 11.” That material was never delivered, and a prompt aimed at it would send students looking for a recording that does not exist. Task 11 covers her closing remarks and stops there.
Her email is not a review target. She points at the closing slide at 17:03 and says her email is at the bottom. No address is spoken on the recording.
Processed for UGA Center for Urban Agriculture / Cut Flower Symposium Archives
Source: Corrected SRT (Stage 1), GTBOP_Transcript_2026-07-23_CassityDuffeySnapdragons.srt (301 blocks); Archive Summary (Stage 2) for chapter structure